Process for the production of lithium diphenylphosphinobenzene-m-monosulfonate
CA 2011800 C · Owner: Kuraray Co. Ltd. · Inventors: Yoshimura, Noriaki; Maeda, Toshihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided an improved industrial process for the preparation of high-purity lithium diphenylphosphinobenzene-m-monosulfonate. The preparation comprises reacting a sodium, potassium or calcium salt of diphenylphosphinobenzene-m-monosulfonic acid with lithium sulfate in an organic solvent.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 8, 1990 and granted May 12, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.